#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>

int main(int argc, char const *argv[])
{
    if (3 != argc)
    {
        printf("Usage: %s <ip> <port>",argv[0]);
        return -1;
    }

    int client_socket = socket(AF_INET,SOCK_DGRAM,0);
    if (client_socket == -1)
    {
        perror("socket err\n");
        return -1;
    }
    
    struct sockaddr_in server_addr;
    server_addr.sin_family = AF_INET;
    server_addr.sin_port = htons(atoi(argv[2]));
    server_addr.sin_addr.s_addr = inet_addr(argv[1]);

    char buf[64]={0};
    while (1)
    {
        memset(buf,0,64);
        fgets(buf,64,stdin);

        ssize_t ret = sendto(client_socket,buf,strlen(buf),0,(struct sockaddr*)&server_addr,sizeof(server_addr));
        if (ret < 0)
        {
            perror("sendto err\n");
            return -1;
        }
        
    }
    
    close(client_socket);

    return 0;
}
